Thursday, August6, 2020
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Marine Weather and Tides
Walhalla, SC

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:43AMSunset 8:29PM Thursday August 6, 2020 8:26 PM EDT (00:26 UTC) Moonrise 9:37PMMoonset 8:27AM Illumination 91% Phase: Waning Gibbous; Moon at 18 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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7 Day Forecast for Marine Location Near Walhalla, SC
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location: 34.77, -83.07     debug


Area Discussion for - Greenville-Spartanburg, SC
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FXUS62 KGSP 062336 AFDGSP

Area Forecast Discussion National Weather Service Greenville-Spartanburg SC 736 PM EDT Thu Aug 6 2020

SYNOPSIS. Passing upper-level disturbances will produce greater than typical coverage of showers and thunderstorms through Friday. A return to more typical isolated to scattered summertime thunderstorm activity is expected over the weekend as weak drying arrives from the west. Moisture will gradually return late in the weekend through the middle of next week to support a more active pattern once again.

NEAR TERM /THROUGH FRIDAY/. As of 735 PM Thursday: Convective coverage will remain high across the mountains and I-40 corridor this evening, with lower coverage elsewhere. While a strong to severe storm is possible, flooding will be a bigger threat as echoes train over the same areas, especially where coverage is better.

Persistence will be the rule for the weather and the forecast of the same for the next 24 hours as the upper trof axis remains in place to our west. Just like last night, we may keep showery precip around parts of the forecast area for the better part of the tonight period before it finally wanes in the pre-dawn hours. On Friday, more of the same. Looks to be a similar pattern to morning low clouds and fog, which could delay onset outside of the mountains. The fcst looks the same in terms of coverage that will go beyond climo in the afternoon. The environment should be conducive to a few pulse severe storms again as well, with sfc-based CAPE in the 2000 - 3000 J/kg range and sfc-delta Theta-e above 30 deg. Temps will be near normal as well.

SHORT TERM /FRIDAY NIGHT THROUGH SUNDAY/. As of 1230 pm EDT Thursday: Deeper moisture and higher PWAT values will be displaced off to our east this weekend as weak upper trough axis translates east and fills. Essentially, for the upcoming weekend, wx conds are expected to be pretty typical of early August, featuring a developing weaker flow regime, and seasonable humidity levels. Dirunally fired deeper convective chances will be close to climo values with piedmont maximum apparent temperatures approaching 95 each day.

LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/. As of 100 pm EDT Thursday: Still expectimg a weak westerly flow regime with embedded weak s/wv's rippling thru to exist atop the SE CONUS to start off the work week. PWAT progs starting on Monday depict a moisting trend after a weekend featuring below climo values. Despite limited Gulf moisture fetch, expecting a daily uptick in diurnal PoPs for showers and thunderstorms each day.

PoPs may increase further above climo Wednesday and Thursday as moisture begins to pool over the region as a frontal boundary lays out across the Mid-Atlantic to the north. Anticipate plenty of lower 90s Piedmont to upper 80s mountain valley max temperatures each afternoon, with mins a degree or so above climo through the period.

AVIATION /00Z FRIDAY THROUGH TUESDAY/. At KCLT and Elsewhere: Thunderstorms continue near some TAF sites and will develop near the others this evening, so have adjusted the TEMPOs for this. Convection should begin winding down around midnight and end overnight. That said, some showers could linger. Otherwise, expect another round of MVFR to IFR cigs, with LIFR or VLIFR possible in some locations. Vsby should generally be MVFR outside of the mountains, but IFR possible. KAVL should have the lowest vsby with LIFR likely and VLIFR possible. Expect another slow improvement after daybreak with vsby improving quickly but cigs slowly rising to VFR and/or scattering out around noon. Looks to be a relatively quick start to convection over the mountains with a slightly slower start elsewhere, so have adjusted PROB30s for that scenario. Winds will be anywhere from SW to SE, except gusty in storms, as outflow boundaries traverse the area. Light and variable wind overnight. S to SW wind expected during the afternoon.

Outlook: Coverage of thunderstorms will be more isolated to scattered during the afternoon and evening over the weekend. Morning fog/stratus restrictions will also be possible, especially over the usual mountain valleys. Diurnal storms will become more likely again from Monday onward.

Confidence Table .

23-05Z 05-11Z 11-17Z 17-18Z KCLT High 100% High 100% High 86% High 100% KGSP High 100% High 100% Low 53% High 100% KAVL High 100% High 95% Med 77% High 100% KHKY High 100% Med 79% Med 68% High 100% KGMU High 100% High 100% Low 48% High 100% KAND High 100% High 100% Low 48% High 100%

The percentage reflects the number of guidance members agreeing with the scheduled TAF issuance flight rule category. Complete hourly experimental aviation forecast consistency tables are available at the following link:

www.weather.gov/gsp/aviation

GSP WATCHES/WARNINGS/ADVISORIES. GA . None. NC . None. SC . None.

SYNOPSIS . CSH NEAR TERM . PM/RWH SHORT TERM . CSH LONG TERM . CSH AVIATION . RWH


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHDS1 - Strom Thurmond Dam, SC 89 mi66 min SSE 1.9 G 5.1 88°F

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Clemson, Clemson-Oconee County Airport, SC12 mi32 minN 010.00 miFair81°F69°F67%1015.6 hPa
Pickens County Airport, SC20 mi31 minN 010.00 miFair82°F76°F84%1016.3 hPa

Link to 5 minute data for KCEU

Wind History from CEU (wind in knots)
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Last 24hrN53CalmNW4N3N4NE3E5NE5NE5CalmN4NE335SE4CalmE44SE535CalmCalm
1 day agoSE3Calm4W4CalmN3E3N3CalmN3N4N3Calm4SE343464N7N6N53
2 days agoNW4NW3CalmW4W3SW3W5W4CalmW3CalmCalmW4W4Calm345W7W9CalmCalmN5Calm

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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GEOS Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Greenville-Spartanburg, SC (20,4,5,8)
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Ground Weather Radar Station Greer, SC
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.